Hi,
I have one problem; I must read a html like this; -
<html>
-
<body>
-
Hello
-
</body>
-
</html>
-
I read this in a string (correct?) and after I have to do some changes to it and write it on disk but in this way: - <html>\n<body>\nhello\n</body>\n</body>
There, there's the '\n' because in the original file <body> was in another line of <html>
How can I do this? This my code for read and write: -
File fin = new File(FILE_NAME);
-
FileReader in = new FileReader(fin);
-
istream = new BufferedReader( in );
-
String line = null;
-
while ( (line = istream.readLine()) != null ) {
-
//System.out.println(line);
-
sb.append(line);
-
}
-
// here do changes on the sb
-
String text = sb.toString();
-
FileWriter fw = new FileWriter(new File ("out.txt") );
-
out = new PrintWriter(fw);
-
out.println(text);
-
Thanks
9  2131  JosAH 11,448
Recognized Expert MVP
The readLine() method returns a String without the terminating end of line character
sequence so you have to append that sequence yourself after you have appended
the line String to your StringBuffer (or StringBuilder). Look at the system properties
for the correct value of the end of line character sequence.
kind regards,
Jos
is there any other "read" method that don't get out '\n' ???
JosAH 11,448
Recognized Expert MVP
is there any other "read" method that don't get out '\n' ???
Sure, you can read parts (or all) of the file directly into a char[] of CharBuffer if
you want. Read the API documentation for details. Note though that an end of
line character sequence need not be a single \n character so don't anticipate
on that.
kind regards,
Jos
to be sincer, for me it's not important to read the file line by line; how can I put the entire file into a String in a hit?
JosAH 11,448
Recognized Expert MVP
to be sincer, for me it's not important to read the file line by line; how can I put the entire file into a String in a hit?
Read the API documentation for the BufferedReader and Reader classes.
You'll find the read() methods you need.
kind regards,
Jos
hello,
read() is ok; but as you can see I have ither problem because I'm a newbie to java; doesn't exist any function like c++ seekg() to seek at the end of my file and retrive the number of characters it has? -
char buf[] = new char[100];
-
int num = istream.read(buf, 0, 100);
-
It's my code but I can't have a fixed dimesion for buf (I mean, 100)....
Can you suggest me more? thanks...
if you use readLine(), you can assume that there is a '\n' character after each call, im not sure how that fits into your program, but if you had a loop like: - while ( (line = istream.readLine()) != null ) {
-
//System.out.println(line);
-
sb.append(line);
-
}
you could use something like
prior to appending it to whatever you are doing.
im not sure if that helps, but i hope it did
good luck,
ken
Nepomuk 3,112
Recognized Expert Specialist
if you use readLine(), you can assume that there is a '\n' character after each call...
That is not 100% correct - there won't be a '\n' character after the last line. So you should use something like this: - read first line
-
while (there is a next line)
-
{
-
add '\n' to your String
-
read the next line and add it to the String
-
}
or alternatively: - while(something)
-
{
-
read next line
-
if there's a next line, add '\n'
-
else quit the loop
-
}
Greetings,
Nepomuk
BigDaddyLH 1,216
Recognized Expert Top Contributor
hello,
read() is ok; but as you can see I have ither problem because I'm a newbie to java; doesn't exist any function like c++ seekg() to seek at the end of my file and retrive the number of characters it has?
Don't forget that the number of bytes is not necessarily the number of chars -- for example, my favorite encoding for HTML, UTF-8.
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